Machine Adapter For Nominal Duct Diameter 24 in Inlet Diameter 24 in Material Steel Product Type Machine Adapter Material Thickness 20 ga Overall Length 5 1/2 in Maximum Pressure Rating 42 in wc Weight 5.6 lb For Duct Height 24 in Flange Inner Diameter Not Applicable For Duct Width 24 in Flange Outer Diameter Not Applicable Maximum Airflow 21 995 cfm Inside Diameter 23 7/8 in Number of Holes on Flange Not Applicable Overall Width 24 in Bolt Circle Diameter Not Applicable